I got this wrong.....can someone please help me solve this?

Question 21 1 / 4 points A metal box is place on a wooden incline that makes an angle of 26.9 degrees above the horizontal. At this angle, the box remains at rest. The box has a mass of 4.23 kg. Set your coordinate so that the positive direction is down the incline. What is the force of friction on the box? (Be careful with this one.) The coefficient of static friction for this metal on wood is 0.48. The coefficient of kinetic friction for this metal on wood is 0.28. Give your answer to the proper number of significant digits. Provide all units as abbreviations, not words (i.e. km, not kilometers). If your unit contains an exponent, use the caret symbol ^ (shift-6). For example m^ 3 If your unit contains a fraction, use a slash with no extra spaces. For example m/s Answer: 18.8 N